Zeekscript

* Fix race in project Makefile (Benjamin Bannier, Corelight)

The Makefile did not work correctly when used with `-jN` with `N>1`
since `test` did not declare its dependency on `build`.

This patch makes that dependency explicit, and also declares `build` as
PHONY so it is always run.

* Fix file selection of pre-commit hook (Benjamin Bannier, Corelight)

The `files` field expects a regexp, not a shell glob. We'd previously
select any file containing `zeek` in its name instead of files ending in
`.zeek`.

With this patch we use the intended selection.

* Add languages to README code blocks (Benjamin Bannier, Corelight)

* Mention pre-commit hook now that we got a release (Benjamin Bannier, Corelight)

* Drop dependency on pytest in default setup (Benjamin Bannier, Corelight)

We can execute our test suite just fine with built-in tooling, so there
was no need to force developers to install `pytest` by default (they can
still use it though).

* Export pre-commit hook (Benjamin Bannier, Corelight)

This allows directly using this repo as a pre-commit hook.

* Reflect removal of init tokens from the grammar (Christian Kreibich, Corelight)

* Allow identity comparison for Node objects (Christian Kreibich, Corelight)

* Bump Github actions to current versions (Christian Kreibich, Corelight)